From: g4ugm@dave.invalid   
      
   On 16/09/2025 22:00, Arne Vajhøj wrote:   
   > On 9/16/2025 4:47 PM, David Wade wrote:   
   >> On 16/09/2025 18:46, Simon Clubley wrote:   
   >>> Especially given that z/OS is actually several years older than VMS   
   >>> and is still going very strongly indeed.   
   >>   
   >> I don't believe its as strong as you believe. Perhaps the Z platform   
   >> is, but z/OS is pretty much limited to traditional big banks and   
   >> airline reservation systems. These systems are all much larger that   
   >> most VMS systems so migration away is harder and riskier.   
   >   
   > I am not sure that the attrition rate for z/OS is less than for VMS.   
   >   
   > But they started at a way higher point, so they are still at a higher   
   > point.   
   >   
   >> Another notable feature of Z hardware is the virtualisation technology   
   >> inherent in the "hardware". So it all comes with multiple Logical   
   >> PARtitions or LPARs which despite their name are more like physical   
   >> partitioning of the hardware, and zVM which uses the "Start   
   >> Interpretive Execution" (SIE) instruction to create Virtual Machines.   
   >>   
   >> DEC never had anything like this.   
   >   
   > I always considered Alpha Galaxy to be somewhat similar to LPAR.   
   >   
      
   Isn't that the layer that translates Vax instructions? LPARs allow   
   multiple operating systems to be run. Could you ever run VMS and ULTRIX   
   at the same time on the same Alpha box.   
      
   > Arne   
   >   
      
   Dave   
      
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